Eugene L Cheung from 42332 Troyer Ave, Fremont, CA 94539, age 52, Phone: (510)6570678

Resumes

Staff Engineer

view source

Location:

Fremont, CA

Industry:

Semiconductors

Work:

Linear Technology
Staff Engineer
Jade Sky Technologies 2009 - 2015
Co-Founder, Design Engineering
Helix Micro Inc. 2007 - 2009
Analog Ic Design Manager
Linear Technology 2003 - 2007
Senior Design Engineer
Bitblitz Communications 2000 - 2003
Senior Design Engineer

Education:

Uc Berkeley College of Engineering 1994 - 1996
Masters Brown University 1990 - 1994
Bachelors

Skills:

Integrated Circuit Design
Semiconductors
Mixed Signal
Integrated Circuits
Analog Circuit Design
Cmos
Circuit Design

Eugene Cheung

view source

Eugene Cheung

view source

Us Patents

System And Method For Tracking A Variable Characteristic Through A Range Of Operation
view source
US Patent:

7714550, May 11, 2010
Filed:

Oct 20, 2005
Appl. No.:

11/253697
Inventors:

Talbott M. Houk - Monte Sereno CA, US
Joseph Duncan - Palo Alto CA, US
Eugene L. Cheung - Fremont CA, US
Assignee:

Linear Technology Corporation - Milipitas CA
International Classification:

G05F 1/44
US Classification:

323272, 323906, 307 51
Abstract:

An analog control circuit is coupled to an apparatus having a variable characteristic over an operating range. A sensing circuit is coupled to the apparatus and the control circuit during the range of operation of the apparatus and is operative to sense the variable characteristic. The operating parameter of the apparatus is controlled to be set at a level corresponding to a prescribed criterion, which may be a maximum or minimum, of the characteristic sensed over the range of operation.

Load Driver With Integrated Power Factor Correction
view source
US Patent:

8525438, Sep 3, 2013
Filed:

May 18, 2011
Appl. No.:

13/110724
Inventors:

Eugene L Cheung - Fremont CA, US
David J Chen - San Jose CA, US
Assignee:

Jade Sky Technologies, Inc. - San Jose CA
International Classification:

H05B 37/02
US Classification:

315291, 315297, 315307
Abstract:

Methods and apparati for forcing the current through a load () in a variable DC electrical circuit to be proportional to the input voltage (V(in)). A circuit embodiment of the present invention comprises a source () of input AC; a rectifier () coupled to the input AC source (), said rectifier () producing a variable DC input voltage; coupled to the rectifier (), a load () having a variable direct current flowing therethrough; and means (-) for forcing the current through the load () to be proportional to the variable DC input voltage.

Control Of Bleed Current In Drivers For Dimmable Lighting Devices
view source
US Patent:

8581498, Nov 12, 2013
Filed:

Feb 10, 2012
Appl. No.:

13/370884
Inventors:

Eugene L. Cheung - Fremont CA, US
David J. Chen - San Jose CA, US
David C. Tournatory - San Francisco CA, US
Assignee:

Jade Sky Technologies, Inc. - San Jose CA
International Classification:

H05B 37/00
H05B 41/00
US Classification:

315121, 315119, 315224, 315291, 315297
Abstract:

Methods and apparati for controlling bleed current (IBLEED) in a driver circuit () for a lighting device (). A method embodiment of the present invention comprises the steps of coupling a dimmer () to an input of the driver circuit (), and forcing the bleed current (IBLEED) to be inversely proportional to the time-averaged voltage (VLEDP) at said lighting device (). The dimmer () consumes power even when the lighting device () is not emitting light.

Switch-Mode Power Supply Voltage Regulator And Methodology
view source
US Patent:

20060097705, May 11, 2006
Filed:

Nov 5, 2004
Appl. No.:

10/981488
Inventors:

Eugene Cheung - Fremont CA, US
Talbott Houk - Monte Sereno CA, US
International Classification:

G05F 1/656
US Classification:

323222000
Abstract:

Pulse width modulation of the connection of a load output terminal to a power supply terminal is effected. In response to a first level of the pulse width modulated signal, the load is disconnected from the power supply terminal, steady-state load voltage is preserved on a capacitor connected between a load output terminal and a power supply terminal, and steady-state load current information is held on a capacitor within the feedback loop. In response to a second level of the pulse width modulated signal, the load is reconnected to the power supply terminal, and load voltage and current instantaneously resume at their correct steady-state values.

Exposed Glass Article With Inner Recessed Area For Portable Electronic Device Housing
view source
US Patent:

20140078412, Mar 20, 2014
Filed:

Mar 15, 2013
Appl. No.:

13/843426
Inventors:

Ming Leong - Saratoga CA, US
Kristina A. Babiarz - San Jose CA, US
Amy Qian - San Jose CA, US
Kevin David Gibbs - San Carlos CA, US
Eugene C. Cheung - San Francisco CA, US
Assignee:

APPLE INC. - Cupertino CA
International Classification:

G06F 1/16
C03C 17/00
C03C 21/00
US Classification:

349 12, 427 58, 427108
Abstract:

Transparent articles for use as outer surfaces of electronic devices and methods therefor are disclosed. A transparent cover can be provided over a display of portable electronic device to provide a protective outer cover over the display. The transparent cover can include material to mark, mask or color a portion of the transparent cover, such portion thereupon becoming opaque. The material can be provided in a recessed portion of an inner surface of the transparent cover, such portion being a portion of the transparent cover that is not over a usable portion of the display. The electronic device can, for example, be a portable electronic device.

Electronic Devices With Optical Identification Sensor
view source
US Patent:

20230074849, Mar 9, 2023
Filed:

Sep 8, 2021
Appl. No.:

17/469673
Inventors:

- Cupertino CA, US
Brian S. Pearson - San Fransisco CA, US
Dong Zheng - Los Altos CA, US
Eugene C. Cheung - Redwood City CA, US
Kenneth J. Vampola - Los Altos CA, US
International Classification:

G06K 19/077
G09F 3/00
G06K 7/12
Abstract:

An electronic device may be attached to an external item. The electronic device may include an optical identification sensor configured to sense a color-encoded tag in the external item when the item is attached to the device. The optical identification sensor may include a board layer, a protective filter layer, wall structures for supporting the protective filter layer on the board layer, a linear array of photodetectors disposed between the board layer and the protective filter layer, a field-of-view restriction filter interposed between the photodetectors and the protective filter layer, and a light source having multiple emitters for illuminating the color-encoded tag. The emitters may be activated sequentially to produce multiple images that are combined to reconstruct an accurate reading of the color-encoded tag, which can then be used to identify the type of external item currently attached to the electronic device.

Force Sensing Architectures
view source
US Patent:

20210089168, Mar 25, 2021
Filed:

Dec 9, 2020
Appl. No.:

17/116907
Inventors:

- Cupertino CA, US
Eugene C. Cheung - Redwood City CA, US
Pey-Jiun Ko - Redwood City CA, US
Po-Jui Chen - Taipei City, TW
Robert W. Rumford - Santa Clara CA, US
Steve L. Terry - Cupertino CA, US
Wei Lin - Santa Clara CA, US
Xiaofan Niu - Campbell CA, US
Xiaoqi Zhou - Cupertino CA, US
Yi Gu - Palto Alto CA, US
Rasmi R. Das - Sunnyvale CA, US
Steven M. Scardato - Sunnyvale CA, US
Se Hyun Ahn - Cupertino CA, US
Victor H. Yin - Cupertino CA, US
Wookyung Bae - San Jose CA, US
Christopher L. Boitnott - Cupertino CA, US
Chun-Hao Tung - San Jose CA, US
Mookyung Son - Cupertino CA, US
Sunggu Kang - San Jose CA, US
Nathan K. Gupta - San Francisco CA, US
John Z. Zhong - Saratoga CA, US
International Classification:

G06F 3/044
G06F 3/041
Abstract:

An electronic device with a force sensing device is disclosed. The electronic device comprises a user input surface defining an exterior surface of the electronic device, a first capacitive sensing element, and a second capacitive sensing element capacitively coupled to the first capacitive sensing element. The electronic device also comprises a first spacing layer between the first and second capacitive sensing elements, and a second spacing layer between the first and second capacitive sensing elements. The first and second spacing layers have different compositions. The electronic device also comprises sensing circuitry coupled to the first and second capacitive sensing elements configured to determine an amount of applied force on the user input surface. The first spacing layer is configured to collapse if the applied force is below a force threshold, and the second spacing layer is configured to collapse if the applied force is above the force threshold.

Transimpedance Amplifiers With Adjustable Input Range
view source
US Patent:

20210091734, Mar 25, 2021
Filed:

Apr 23, 2020
Appl. No.:

16/856103
Inventors:

- Limerick, IE
Jeremy WONG - Sunnyvale CA, US
Eugene CHEUNG - Fremont CA, US
Brian HAMILTON - Menlo Park CA, US
Gregory FUNG - Fremont CA, US
Assignee:

Analog Devices International Unlimited Company - Limerick
International Classification:

H03F 3/45
H03F 3/68
H03F 1/02
H03M 1/12
Abstract:

A multi-stage transimpedance amplifier (TIA) with an adjustable input linear range is disclosed. The TIA includes a first stage, configured to convert a single-ended current signal from an optical sensor of a receiver signal chain to a single-ended voltage signal, and a second stage, configured to convert the single-ended voltage signal provided by the first stage to a differential signal. In such a TIA, the input linear range may be adjusted using a clamp that is programmable with an output offset current to keep the second stage of the TIA from overloading and to maintain a linear transfer function without compression.